Looking for an off-grid solar installer for new Victron Energy dual Quattro 10k inverter - Discover Energy Helios battery system near Fresno, Calif.

Bit of an odd one for me to weigh in on given I'm on a narrowboat in Yorkshire and you're talking Fresno, California — fairly different contexts!

That said, a dual Quattro 10k setup is serious kit regardless of which side of the Atlantic you're on. Victron's ecosystem is genuinely well supported globally, so finding an installer with hands-on Quattro experience shouldn't be impossible — though I'd specifically ask whether they've done split-phase or three-phase configurations before, because paralleling Quattros has its quirks and you really want someone who's done it more than once.

On the Discover Energy Helios side — less familiar with that particular battery here in the UK (we tend to see a lot of Pylontech, Fogstar, and BYD), but from what I understand they're a solid lithium option. Key question is whether your prospective installer has actually commissioned that specific battery with Victron before. The CAN bus communication setup between battery BMS and Victron kit needs to be done properly or you'll have endless headaches.

A few things worth asking any installer:

• Do they use VictronConnect / VRM for remote monitoring setup?
• Can they provide references from similar-scale installs?
• Are they familiar with Victron's DVCC settings for managed batteries?

Would be worth posting over on the Victron Community forum too — they have a decent installer directory and the community there will spot a dodgy config a mile off.

Anyone else here had experience with Discover Energy batteries alongside Victron? Curious how well they play together.

Bit outside my area — both geographically and in terms of scale! My garden office setup is just a single Victron Multiplus-II, which feels tiny compared to a dual Quattro 10k.

One thing worth flagging: this forum is primarily UK-focused, so finding a Fresno-based installer through here seems unlikely. You'd probably have better luck on a US-specific forum like diysolarforum.com where there are members actively working with Victron commercial installs stateside.

The Discover Helios batteries are an interesting choice — curious what led you to those over something like a Victron Lynx-compatible BMS solution? That compatibility question alone seems worth nailing down before your installer quote, regardless of which side of the Atlantic you're on.

@GeorgeJohnson83 fair enough, a garden office Multi is a world away from dual Quattro 10kVAs.

I'll be straight with you though — a US installer for Fresno isn't something anyone here is likely to recommend with confidence. This is a UK forum. We know our NAPIT-registered sparks and MCS-certified installers, not California contractors.

What I can say is that a dual Quattro install of that scale deserves someone who genuinely knows Victron's three-phase and parallel configuration inside out. The Discover Helios batteries are a decent shout but the BMS integration with VE.Can needs careful setup.

Your best bet would be the Victron Energy dealer locator on their official site — filter by region. Victron-certified installers in the US will have done the training. Don't just take whoever quotes cheapest; a botched parallel inverter setup is a genuinely dangerous thing.

Bit out of my lane geographically — cabin in the UK here, not California — but worth saying that for a dual Quattro 10k paired with Discover Helios batteries, you really want someone with specific Victron ESS experience and ideally NABCEP certification for your side of the pond.

Victron's installer locator is worth a proper look if you haven't already. Filter by commercial/large residential — that scale of system isn't something a generalist solar outfit should be touching.

The Discover Helios kit is decent but the integration config with Quattros needs someone who knows what they're doing in VEConfigure. Wrong settings and you'll have a bad time.

Discover Energy Helios batteries paired with dual Quattro 10kVAs is properly beefy kit — my Fogstar Drift cells are sitting in a corner feeling inadequate right now.

For finding an installer Stateside, NABCEP certification is your golden ticket — it's roughly the US equivalent of what MCS is over here, so filter hard for that when you're shortlisting.