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G3ZJO > TECH 20.03.06 23:17l 21 Lines 761 Bytes #999 (0) @ WW
BID : 7D0372G3ZJO
Read: OE7HNT DB2OY DL1LCA GUEST OE7FMI
Subj: Re: Paralel Batteries
Path: DB0FHN<DB0MRW<DB0SON<DB0SIF<DB0EA<DB0RES<DK0WUE<7M3TJZ<KP4IG<ED1ZAC<
GB7YKS<GB7SYP<GB7BEN
Sent: 060320/1339Z @:GB7BEN.#43.GBR.EU #:44241 [Bletchley] $:7D0372G3ZJO
From: G3ZJO@GB7BEN.#43.GBR.EU
To : TECH@WW
M1BYT wrote:-
> Even assuming one flat and one fully charged, the small difference in voltage
> between them would mean that the current flow would be relatively tiny.
The current under these conditions could easily be greater than the
maximum recommended charging rate for a leisure battery.
> It is also standard practise for those using caravans to have the second
> battery connect via a relay which connects the batteries in parallel as soon
> as the engine is running.
The situation with a car / caravan is that there is a resistance between
the two batteries, namely the relatively long and thin wiring. In practice
this limits the charging current to around 7 Amps with the engine running.
Eddie G3ZJO
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