Some cable values for you. 15m each way at 10A gives -
Cable mm2 Volt drop 2.5 2.3 6.0 0.9 10.0 0.6 25.0 0.23
If you move the inverter close to the batteries 2m each way at 10A gives
Cable mm2 Volt drop 2.5 0.3 6.0 0.13 10.0 0.08
So as said you either need to move the inverter or run a much heavier cable. Assuming you move it to be close to the batteries I would use at least 6.0mm2 but if I was buying, then for the small extra cost I would get 10mm2 cable.
There will also be a small additional volt drop from the fuse, switch and connections hence use thick cable to keep the total down.
By the way, that 'over 2V' that I mentioned wasn't a guess, I worked it out at 2.16V 😀
Wow, no wonder the Icom used to cut out when I transmitted!
Ok. So maybe I should look at getting a proper inverter and fit it in the engine room close to the batteries. Then I need to find a suitable way to switch between that and the genny. Then both supplies can be switched into my existing 240v genny circuit. I'll leave the shore line circuit alone.
I'll also look at buying some LED lights.
That should do the trick. Thanks again Nick & Tony.
'amps divided by three' is a good rule of thumb for getting the minimum cable cross section in mm2
So if the inverter draws up to 15A say, that gives 15/3 = 5mm2, or 6mm2 rounded up to the next cable size.
For things like inverters and chargers, they prefer to be near the batts to minimise volt drop, so I'd try to get them within about 6ft to keep the 'round trip' cable distance below 5m.
For most other things if the round trip is more than 10m, the above cable size will need to be increased proportionately.
Some stuff though, like 12V fridges, diesel heaters are a special case and the manufacturers requirements must be met.
That said, as said it wouldn't hurt to use 10mm for the inverter if the price is similar, it would allow a slightly bigger one to be fitted later on if need be.
You'd want fuse near in the inverter feed positive, near but (not in!) the batt box. If the inverter instructions doesn't specify a rating, a 15A one will protect the cable fine. 'Trirated' cable off Ebay or a discount supplier is usually pretty good value.
loddon: Thanks for the confirmation, I am thinking of changing tablets because of the cough but maybe I wont
Mar 31, 2020 13:07:45 GMT
JohnV: There are other drugs but I haven't found the side effects with Ramipril to be bad, it seems to just make my throat a bit more sensitive so things that might have just tickled my throat and make me want to clear it now make me cough.
Mar 31, 2020 13:58:31 GMT
loddon: The cough is the only one I get from ramipril, although the combinatins of drugs I am on has interesting effects.
Apr 1, 2020 15:56:47 GMT