asked
Can I charge a multiplus 12/3000/120 with an identical charger on another boat?
You can't 'charge' a MultiPlus. A multiplus is a combined charger/inverter. It's not a battery.
Sorry my description was not clear. The multiplus is connected to a battery. I need to charge the battery.
I don't think interconnecting the two boat's DC systems is a good idea due to the long, large cables needed. You could take AC out of one boat and use it as "shore power" on the second boat.
Trying to understand here.
You want to use a multiplis ac out to another multiplus ac input to boost the battery on the second unit in the chain? Is this using the shore power through the first unit to the second?
@Kevin Windrem mentioned this ac to ac connection.
Yes you can if the charge limit (or input current limit) is down on the second unit so as to not overload the first unit or the input of the one on the shore limit.
Thanks. The answer seems to be yes I can charge the batteries on a second boat from the AC output of the first if the input current limit is down on the second unit. I know this is not an efficient way to do it but occasionally it is the most convenient. I do not have an on grid supply. Normally the solar will suffice but sometimes I need to top up.
