|
Post by Murgatroyd on Jul 1, 2024 16:38:29 GMT
I followed it with plain set yoghurt. Which was nice.
|
|
|
Post by The Cat Man on Jul 1, 2024 16:47:40 GMT
Just (in the last couple of days) turned the fridge and freezer back on, after getting some new batteries installed (1 x 140a AGM plus 1 x 280a lithium). I wasn't really convinced there would be that much difference between getting 4 new 110a LAs - how wrong I was! Batteries never below 13.2v even on a cloudy day like today.
Looking forward to being able to batch cook again.
|
|
|
Post by dogless on Jul 1, 2024 16:50:28 GMT
Had a walk into Tring and back. Nice little town and there's an occasional bus so shopping can be done too. Rog
|
|
|
Post by Telemachus on Jul 1, 2024 16:54:25 GMT
Just (in the last couple of days) turned the fridge and freezer back on, after getting some new batteries installed (1 x 140a AGM plus 1 x 280a lithium). I wasn't really convinced there would be that much difference between getting 4 new 110a LAs - how wrong I was! Batteries never below 13.2v even on a cloudy day like today.
Looking forward to being able to batch cook again.
Well this of course is because the Li Battery stays at around 13.2v until it is nearly flat! Don't be fooled by the voltage.
|
|
|
Post by The Cat Man on Jul 1, 2024 16:57:35 GMT
Just (in the last couple of days) turned the fridge and freezer back on, after getting some new batteries installed (1 x 140a AGM plus 1 x 280a lithium). I wasn't really convinced there would be that much difference between getting 4 new 110a LAs - how wrong I was! Batteries never below 13.2v even on a cloudy day like today.
Looking forward to being able to batch cook again.
Well this of course is because the Li Battery stays at around 13.2v until it is nearly flat! Don't be fooled by the voltage. What should I be looking for/at, please.
|
|
|
Post by on Jul 1, 2024 17:00:51 GMT
|
|
|
Post by The Cat Man on Jul 1, 2024 17:06:01 GMT
Is there a way of simplifying that for a numpty?
|
|
|
Post by Clinton Cool on Jul 1, 2024 17:10:02 GMT
The voltage drops off really slowly down to around 95% discharged but then it drops like a stone. I'd suggest voltage is a risky way to monitor state of charge.
|
|
|
Post by The Cat Man on Jul 1, 2024 17:15:09 GMT
And how do I do that simply?
|
|
|
Post by Telemachus on Jul 1, 2024 17:16:45 GMT
Is there a way of simplifying that for a numpty? It means that a Li battery at 80% SoC and a Li battery at 30% SoC have very similar no-load voltages. Yes there is perhaps 0.2v difference between the two states, and 13.2v is probably around 70% if that is the exact figure. The point being that it is less easy to estimate SoC of a Li battery by looking at voltage, than it is for Lead Acid. And of course Lead Acid only starts at 12.8v or so when fully charged, whereas 12.8v for Li is about 20% SoC or less.
|
|
|
Post by Clinton Cool on Jul 1, 2024 17:18:49 GMT
I don't know. Maybe an expert will be along shortly. As for reading the graph though: Just multiply all the readings on the left by 4. This is your voltage. The figures along the bottom are the fraction of 1. 1 being 100% charged.
|
|
|
Post by Telemachus on Jul 1, 2024 17:19:17 GMT
And how do I do that simply? It is better to use an amp-hour counter such as a BMV712 if you want to know your SoC. That said, with a hybrid system (Li in parallel with LA) it is not going to be super accurate, but better than looking at the voltage.
Of course it depends on how accurately you want to know the SoC and maybe it doesn't matter too much because as the Li gets close to flat, the LA will take over and you will get a long slow decline in voltage as the LA discharges. If you keep the LA above 50% (12.2v) then you will not damage the Li.
|
|
|
Post by The Cat Man on Jul 1, 2024 17:21:01 GMT
Thanks Nick.
|
|
|
Post by dogless on Jul 3, 2024 7:22:25 GMT
An actual rainy morning ... it's been a while.
Rog
ETA maybe not ... stopped after 20 mins ... cloudy but dry 👍🏻
|
|
|
Post by on Jul 5, 2024 5:51:34 GMT
Cold and wet. Fire will be lit.
|
|