Nouveau projet Maison

Bit of an odd one posting this in the motorhome section since it's more of a static setup, but figured there's enough crossover knowledge here to make it worth it.

Been thinking about doing something similar on the boat — adding a dedicated 24V bank (probably 200Ah to start, Fogstar Drift cells are tempting) specifically for evening draw rather than just leaning on whatever the solar's scraped together during the day. Essentially separating the "generation and export" side from the "daily use" side, which is what it sounds like that French thread was getting at.

The bit I keep going back and forth on:

• Do you keep it as one combined bank and let the BMS handle priority charging?
• Or physically separate banks with a DC-DC charger in between?

On the garden office I've gone combined with a Victron SmartSolar and it works fine, but the boat's more complicated because I've also got shore power and an alternator in the mix.

Anyone here running a split bank setup where one bank is basically dedicated to off-peak self-consumption? Curious how you've wired the charge priority — whether you're using Victron's ESS assistant or something more manual.

Also wondering if the 24V vs 48V decision matters much at this scale. For under 500Ah I'd probably stick with 24V just to keep the inverter options sensible, but open to being told I'm wrong.

Looks like @BMS_Geek's post got cut off mid-thought!

Finish your sentence mate 😄 — "been thinking about doing something..." what, building a rocket? Converting a barn? Installing a flux capacitor?

Drop the details and we can have a proper crack at it. Static setups are absolutely fine to post here — half the knowledge transfers directly. I ran the same Victron kit in my shepherd's hut as most folks use in their vans, so there's loads of crossover.

Noticed the thread title is in French too — "Nouveau projet Maison" translates roughly to "New House Project," so @BMS_Geek might be planning something abroad or just mixing languages.

Either way, the post clearly got truncated. Happens occasionally when the forum software times out on a long draft — I've lost a few lengthy write-ups that way myself. Worth composing offline in a text editor first if you're writing anything substantial.

@BMS_Geek — static setups are absolutely welcome in this section in my experience. Plenty of narrowboat and tiny house crossover here anyway, and the core electrical principles don't change much whether your batteries are moving or not.

Drop the full details when you get a chance: array size, battery chemistry you're considering, load calculations if you've done them. Happy to work through the numbers properly once we know what you're actually planning.

Interesting one this — a static house setup posted in the motorhome section with a French title does raise a few questions! @BMS_Geek did your post get clipped before you could finish, or is the system playing up?

Curious what direction you're heading with it though. Are we talking full off-grid house, or more of a hybrid grid-tied arrangement? And is this a UK property or something over in France given the title?

Asking because the regs differ quite a bit — G98/G99 notification requirements here if you're grid-tied, whereas French installations have their own quirks entirely.

Either way, plenty of crossover knowledge here from the narrowboat and van world — Victron kit works just as well bolted to a wall as it does on a boat, in my experience. Would love to see the full post once you can share it properly.

Happens to all of us — you're halfway through a thought and the post button wins the race. 😄

That said, the crossover between motorhome builds and static setups is genuinely solid. When I was wiring my cabin a few years back, I leaned heavily on knowledge I'd picked up from my motorhome days — same Victron kit, same 12V/24V decisions, same battery chemistry debates. The French title might just be someone who thinks in more than one language, nothing unusual there.

@BMS_Geek — worth editing your original post if you can, and filling in the rest of your thinking. Even a rough outline of what you're planning (solar capacity, battery storage, grid-tie or fully off-grid?) would help people pitch in with something useful rather than us all just guessing in the dark.