|
Post by Jim on Feb 24, 2020 20:33:43 GMT
How many of us change batteries with no fuss or bother. How many times over the years, thousands, between us! Get a grip, naysayers.
Just don't let your spanner touch owt when undoing the bolts. Replace the terminals with clamp ones, then no spanners in future if you are bothered. Turn your off your isolator first. Smear posts and terminals with vaseline before assembly, stops corrosion and salts building up.
Get Pirkko to sneak up behind you with a pan and a ladle, give it a whack just as you disconnect. This will cure your fear, aversion therapy. ππ€£
PS, I don't know if you have solar, if you do, isolate the panels from the mppt controller before disconnecting or isolating batteries. If you don't have an isolator on the positive feed to controller, then cover your panels with a blanket.
|
|
|
Post by TonyDunkley on Feb 24, 2020 21:37:41 GMT
How many of us change batteries with no fuss or bother. How many times over the years, thousands, between us! Get a grip, naysayers. Just don't let your spanner touch owt when undoing the bolts. . . . . . . . . . . . . . . It doesn't matter how many people get away with something which CAN result in horrific injuries if done without taking the long established and recognized elementary precautions or observing the correct sequence for making or breaking battery connections, . . especially if they happen to be vented lead acid jobs. One person NOT getting away with it is one too many ! I have witnessed someone having a battery blow-up in their face, and it's not something I'd want to witness, or hear of, happening ever again. There's nothing clever about exposing yourself to unnecessary risks, . . or encouraging others to !
|
|
|
Post by Jim on Feb 24, 2020 21:44:07 GMT
How many of us change batteries with no fuss or bother. How many times over the years, thousands, between us! Get a grip, naysayers. Just don't let your spanner touch owt when undoing the bolts.Β Β . . .Β Β Β . . .Β Β Β . . .Β Β Β . .Β Β . .Β Β . It doesn't matter how many people get away with something which CAN result in horrific injuries if done without taking the long established and recognized elementary precautions or observing the correct sequence for making or breaking battery connections, . . especially if they happen to be vented lead acid jobs. One person NOT getting away with it is one too many ! I have witnessed someone having a battery blow-up in their face, and it's not something I'd want to witness, or hear of, happening ever again. There's nothing clever about exposing yourself to unnecessary risks, . . or encouraging others to ! Of course there is a risk, but what's the likelihood? Risk measurement is Severity of accident x likelyhood. Simple precautions drop the severity and therefore the risk level down. Wear safety goggles or a face shield if you want. TonyDunkley do you change your own batteries?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 24, 2020 21:48:35 GMT
|
|
|
Post by TonyDunkley on Feb 24, 2020 22:13:02 GMT
How many of us change batteries with no fuss or bother. How many times over the years, thousands, between us! Get a grip, naysayers. Just don't let your spanner touch owt when undoing the bolts. . . . . . . . . . . . . . . It doesn't matter how many people get away with something which CAN result in horrific injuries if done without taking the long established and recognized elementary precautions or observing the correct sequence for making or breaking battery connections, . . especially if they happen to be vented lead acid jobs. There's the relevant bit of my last post, . . for those having difficulty in reading or understanding it, . . and for those who don't know that there are elementary precautions to take, or that there are correct, and safe, connection/disconnection sequences for both changing batteries and using jump leads.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 24, 2020 22:22:10 GMT
(snip) Going back to your suggestion of excess pressure it's an interesting point. Would excess pressure on a diaphragm pump of this kind put extra load on the electric supply line increasing the amp draw? I would think not but I suppose it's possible. (snip) It does. Β When an electric motor is spinning, it generates a voltage in opposition to the voltage driving it. Hence, startup current is a lot higher than running current. If the motor is loaded, it slows slightly, the voltage it's generating decreases, the voltage seen by the armature increases towards the supply voltage, and current drawn increases. A sort of negative feedback loop. I know how motors work but I wondered if the type of pump referred to might not be a completely positive displacement type. I suppose it probably is positive rather than non positive displacement. Never actually experimented with wiring one up (without the pressure switch) and turning it on with a blocked outlet and the clamp meter over one of the supply wires. They do have a bit of suction but I think they also have some leakage past the valves and would operate with ports blocked. This is likely to draw more current though to be fair yes. I'm not convinced they can be stalled though. Would need experiments.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 24, 2020 22:27:06 GMT
Just check if it's flat first using the old 12 inch steel ruler across the terminals. If you can hold it there then it definitely is flat.
|
|
|
Post by TonyDunkley on Feb 24, 2020 22:49:27 GMT
How many of us change batteries with no fuss or bother. Yeah but this isn't 'changing batteries'. I shall take pics for you all to see. Probably a dead simple job for an electrician, but for me a puzzle until I work it out. Our boat's electrics are weird and one day it would be nice to find someone to explain it all to me. But I can't see that day ever coming. Still... everything works. Ross, when you're ready to change your battery terminals put some photo's on here and call me on 07553 294325 and I'll talk you through what you need to do. There's no risk or danger at all, and certainly no need for any of the stupid suggestions about protective suits and masks. All that's necessary for you to do this perfectly safely yourself is to observe good practice and correct connection/disconnection sequences. You'll be fine!
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 24, 2020 22:52:42 GMT
Just to clarify the hazmat suit comment was a "giggle".
Another point to make is that when replacing batteries in future it's worth considering going for the type which have vertical threaded posts that way you don't need to use terminal clamps in the first place.
You would still have to observe safe wiring disconnection procedures by getting the negative off first but you take out the agro which is sometimes associated with the tapered post clamps.
|
|
|
Post by Jim on Feb 25, 2020 7:01:38 GMT
It doesn't matter how many people get away with something which CAN result in horrific injuries if done without taking the long established and recognized elementary precautions or observing the correct sequence for making or breaking battery connections, . . especially if they happen to be vented lead acid jobs.Β There's the relevant bit of my last post, . . for those having difficulty in reading or understanding it, . . and for those who don't know that there are elementary precautions to take, or that there are correct, and safe, connection/disconnection sequences for both changing batteries and using jump leads. So why keep it secret, why get shouty? Why not just tell those that don't know? Just an excuse to be an old curmudgeonly grumpfuttock. If the isolator is turned off it doesn't matter which is disconnected first, the positive has already been disconnected. It's still wise to disconnect negative pole first, there's probably a bilge pump still connected. Though if you wish to be super cautious you could take the fuse out of the permanent live. TonyDunkley do you change your own batteries?
|
|
|
Post by TonyDunkley on Feb 25, 2020 7:34:55 GMT
There's the relevant bit of my last post, . . for those having difficulty in reading or understanding it, . . and for those who don't know that there are elementary precautions to take, or that there are correct, and safe, connection/disconnection sequences for both changing batteries and using jump leads. . . . If the isolator is turned off it doesn't matter which is disconnected first, the positive has already been disconnected . . . . . Really !! . . . have a think about that, . . it's on a par with what Mr Shit-for-brains said earlier, . . . unless you've got tanker spec. two pole isolators on all your batteries !
|
|
|
Post by Mr Stabby on Feb 25, 2020 7:50:50 GMT
I don't see any connection (no pun!) between our main switch / isolator and the batteries. A battery is 'live' if it's got a potential difference inside it (or the potential to create a PD). Anyway, the Sun is rising, enough chit-chat for now. Well, look at it this way. If you had a battery and two battery terminal clamps with no cable attached to them, you could spend all day putting the clamps on the battery, then taking them off again without them once sparking.
|
|
|
Post by Jim on Feb 25, 2020 8:51:56 GMT
. . . If the isolator is turned off it doesn't matter which is disconnected first, the positive has already been disconnected . . . . . Really !! . . . have a think about that, . . it's on a par with what Mr Shit-for-brains said earlier, . . . unless you've got tanker spec. two pole isolators on all your batteries ! It minimises a small risk. You keep avoiding the questions. Why keep the correct method secret? It's better to disseminate good practice. Do you change your own batteries?
|
|
|
Post by Mr Stabby on Feb 25, 2020 9:16:56 GMT
Yeah but this isn't 'changing batteries'. I shall take pics for you all to see. Probably a dead simple job for an electrician, but for me a puzzle until I work it out. Our boat's electrics are weird and one day it would be nice to find someone to explain it all to me. But I can't see that day ever coming. Still... everything works. Ross, when you're ready to change your battery terminals put some photo's on here and call me on 07553 294325 and I'll talk you through what you need to do. Take the batteries out and leave them sitting on the stern deck for three weeks?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 25, 2020 9:40:51 GMT
Really !! . . . have a think about that, . . it's on a par with what Mr Shit-for-brains said earlier, . . . unless you've got tanker spec. two pole isolators on all your batteries ! Why keep the correct method secret? Because this way only the chosen are privy to the gospel...
|
|