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I'm working on a cargo-trailer build right now - mostly to power small music festivals and such. I've got panels, 20kWh of SOK server-rack batteries in rolling racks (hoping to add another two units for 30kWh) - but still debating on inverter choices. I'm looking for around ~6,000w/50a of...

I have (4) of these batteries - with less than 10 cycles on them - almost new! Great drop-in replacement for RV's, boats, 12v systems, or for off-grid solar projects etc. Can be wired in series for 24/48v operation too. When reliability matters - don't risk the cheap no-name batteries - Lion...

I'm building a semi-modular off-grid/ESS system in a 5' x 8' cargo trailer for special event (not daily) use, and looking for design feedback. I was interested in the EG4 6000xp - but won't have split-phase charging ability, and getting to the minimum 120v MPPT will be challenging with the...

I'm building a semi-modular system in a cargo trailer and looking for advice on wiring / fusing / DC distribution - with a goal of keeping a simple/small footprint that would allow me to add/remove batteries occasionally. Appreciate any guidance here! I have (2) banks of batteries (each pair...

I'm spec'ing out a 5x8 cargo trailer build - for powering small concerts, festivals etc. Likely starting with a EG4 6500ex unit, with the possibility to add a 2nd unit in a few months for true split-phase/50a operation. For batteries - I'm in the debate of server-rack (EG4 or SOK likely) vs a...

I have an existing 4kW residential rooftop PV system - with a SMA Sunny Boy 4000TL inverter, grid-tied. California, fully permitted. I've got experience/understanding in off-grid solar, and am building a semi-portable server-rack rig (in a cargo trailer) ~20kWh. Currently debating EG4/SOK...

I'm struggling to find useful info for this online - anyone have experience shipping 2nd-hand server rack batteries (not via the manufacturer)? This would be domestic US, I understand ground is the way to go, but I'm looking at ~600 lbs, so presumably a LTL (less-than-load) pallet. Any advice...

I have (4) Lion Safari UT-1300's for sale in the SF Bay Area. I bought them 2 years ago for a project that never manifested - so they literally have less than 5 cycles on them - they are almost new! I kept them charged every 3 months, and they have been stored indoors. Asking $600 each, or a...

Anyone in Las Vegas willing to rent a small Solar Generator (or Battery/Inverter) rig? I'm doing a work project there and need off-grid power Jan 16-18th. Need 1500w minimum (1kW load - just a video projector) and a 2kWh battery would be plenty. Will be used both on the 16th and 17th, and...

All bought for a project with a friend that never got pursued. But all the items seem to be in new condition, typical AliExpress generics (but all working) - and its a complete rig for a solar, off-grid, or portable power system. Golf cart? RV? Solar Generator? Burning Man system? Lots of...

I have two Rich Solar 200w "24v" panels. I have tried each individually in perfect sun, with various orientations, on numerous days. I've used several different charge controllers (2 different Bluetti ac200max's, an Epever MPPT, and a Victron MPPT), and different cables to the controllers. At...

Seems like there's a slew of portable/modular units about to come out (Inergy Flex, Ecoflow DeltaPro & Max, Bluetti AC300/200 pro, Titan 2.0 etc)- with expandable batteries becoming the norm. I'm curious people's opinions on the latest beyond the obvious stated specs - but practical usage, build...

I'm looking to build out a cargo trailer that can provide power primarily for mobile sound/PA systems at festivals and rallies- and looking for any advice on the general concept, design, or equipment options. I'd like to be able to supply around ~6kw at 120v AC. But I'd also like to have...

I'm curious as to what people think about the next generation of inverters - not 5 or 10 years down the road, but say... in the next year or two - specifically in the U.S. market. It seems clear that the interest/market segment/tech for this is rapidly taking off, as evidenced by the soaring...

I've been using Anderson SB175 1/0 AWG cables for a quick dis/connect between my battery bank and inverter. (currently 4x 12v 100ah - wired in pairs to be 24v). It's a portable/modular rig with components in separate cases, so my goal is for easy transport and quick setup in the field. I'd...

I've had a cheap 3,000w 24v inverter with duplex plugs built-in for a portable (hand-truck style) rig. I'm upgrading to a Victron Multiplus 3000/24 - but have some questions about AC output wiring - specifically on how to keep everything compact/portable, while also minimizing voltage loss...

I'm rebuilding a DIY portable "solar generator" rig - and looking for a better ideas on enclosures. I'm trying to balance portability/weight, with ease of use, and protection (physical and some light weather protection). Basically - I've got (4) group-24 size batteries, a 3kw inverter (about to...

I'm looking for a single-conductor connector for panels (so I can switch between series/parallel wiring) - that doesn't need a tool to disconnect, and that can handle frequent dis/connecting for a portable setup. So... not MC4's. I don't need anything weatherproof - these are just used for...

I picked up a pair of 110w Sunpower flexible panels from AliExpress (based on another post) - but I'm using them for a portable setup. Any tips on a frame that can act as a suitcase, and be lightweight for portable use, but rigid enough to protect the panels from bending too far? I mounted them...

I'm looking for suggestions on cabling and connectors for my system/s - replacing MC4's with something tool-less that lets me quickly switch between series/parallel panel setups. My usage is off-grid power for special events (small sound systems typically), and I try to keep things as modular...