Help needed to check caravan installation design

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brianor asked Oct 29, '21

Help needed to check caravan installation design

Hallo,

I am working on the design of a power system for a camper and would appreciate some pointers where I have it wrong (or could improve).

The following components are included:

Victron Smart Solar MPPT 100/30
Victron Multiplus 12/1200/50 220V
Victron Cerbo GX
Victron BMV-712 Monitor
JA Solar 405W Mono Panel
Blue Nova LiFePO4 218AH 12V Battery

The areas I am uncertain is the connectivity between shore power and the camper's AC Distribution Board 220V (via the Multiplus), and the connection of devices to the camper's DC Distribution Board 12V (see picture of control panel in camper). Also, the use/spec of fuses/breakers in the circuit?

BL Wiring Flat.pdf

Many thanks!

cerbo gx multiple inverters wiring diagram

img-12051.jpg (285.7 KiB)

bl-wiring-flat.pdf (475.7 KiB)

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Modifications Space

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Answer 1 · 2021-10-29T16:13:37Z

Kevin Windrem answered · Oct 29, 2021 at 04:13 PM

The wiring diagram you provide looks correct. Note that the neutral for the AC input to the Multi needs to be isolated from the neutral in the distribution panel. So a shore power breaker in a separate enclosure would be best. You may also want an inverter bypass to run AC devices should the inverter fail.

The DC input to the Multi should probably not go through the distribution panel. There is a huge current spike when turning on the DC due to capacitors in the Multi. This will probably trip the breaker requiring a second or third attempt. But more importantly the current could damage the breaker over time. It would be best to keep the Multi DC connected at all times. Use a fuse or breaker with a "pre-charge circuit" around it. The pre-charge circuit is a resistor across the breaker with a button you push for a few seconds prior to closing the breaker/fuse. Connecting the Multi directly to the battery would also reduce the ampacity of the connection to the DC distribution.

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Answer 2 · 2021-10-29T18:48:01Z

kevgermany answered · Oct 29, 2021 at 06:48 PM

Nit picking, the 12V to the DC from the multi is labelled mains.

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brianor commented · Nov 03, 2021 at 04:10 PM

Thanks, the "Mains" is label on breaker on 12V DB Board in caravan (see photo above). My thinking was to use this to switch Multi power on/off without having to do so on the switch on Multi?

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