So apparently my current inverter has decided to join the ranks of other things that don't work in my 2005 32' Southwind (looking at you, slide-out motor and that one cabinet door that refuses to stay closed). Time for an upgrade!
I've got 400W of solar (4x100W panels) and 4 6-volt batteries powering this rolling money pit. Currently rocking a 1000W unit that keeps throwing error codes like it's having an existential crisis. I'm torn between going with a 2000W or 2500W pure sine wave inverter - brands like Aims Power and Renogy keep popping up in my research.
Will my current battery bank handle a 2500W unit, or should I stick with 2000W? I'd rather not discover the hard way that I've created an expensive paperweight. Any recommendations before I throw more money at this beautiful disaster?
For your 2005 Southwind with 400W solar and 4 6V batteries, upgrade to a 2000W pure sine wave inverter like the Aims Power or Renogy models. A 2500W unit may strain your battery bank unless you upgrade to lithium or add more lead-acid capacity.
Find these on Amazon: Aims Power 2000W Pure Sine Wave Inverter , 4/0 AWG Battery Cable Kit , 250 Amp ANL Fuse Kit
For your 2005 32-foot Southwind with 400W solar and four 6-volt batteries, I'd recommend sticking closer to 2000W rather than 2500W for your inverter upgrade. Your current battery bank (likely around 440-450 amp-hours if they're golf cart batteries) can reasonably support a 2000W continuous load, but a 2500W inverter might strain the system. The Go Power failure you're experiencing is common with their older units, so upgrading is definitely the right move.
Your four 6-volt batteries wired in series-parallel likely give you around 220Ah at 12V (assuming Trojan T-105 or similar). A 2000W inverter draws about 190 amps at full load (including inverter efficiency losses), which your battery bank can handle for short periods. A 2500W unit would pull about 230 amps (including inverter efficiency losses), which could damage your batteries or trigger low-voltage shutoffs frequently.
Your 400W solar array provides good recharging capability but remember it only produces peak power for 4-6 hours daily. In winter or cloudy conditions, you'll get significantly less. A 2000W inverter gives you plenty of power for most RV appliances without overwhelming your charging capacity.
Upgrading from 1000W to 2000W means doubling your current draw. Check your existing DC wiring - you'll likely need to upgrade to 4/0 AWG cable for runs over 4 feet, or 2/0 AWG for shorter runs. Use the same gauge for both positive and negative connections.
Install a 200-225-amp fuse or breaker within 18 inches of your battery bank. Many RVers overlook this critical safety component. Also ensure your existing ground connection can handle the increased amperage - upgrade to the same gauge as your positive cable.
Even with a 2000W inverter, be realistic about simultaneous loads. Running your microwave (1200W), coffee maker (800W), and TV (200W) simultaneously would exceed capacity. Prioritize loads and consider upgrading to lithium batteries if you need more power capacity.
Your Southwind likely has a residential refrigerator if it's been converted, which could draw 300-600W when running. Factor this into your power budget along with other continuous loads like fans and electronics.
If you find yourself wanting to run the 2500W inverter, consider upgrading your battery bank first. Adding two more 6V batteries would give you better capacity, or switching to lithium would provide more usable power in the same space. Lithium batteries can safely discharge to 20% vs 50% for lead-acid, effectively doubling your usable capacity.
If you're uncomfortable working with high-amperage DC systems, or if your RV's electrical system seems complex with multiple sub-panels, call a qualified RV technician. Also, if you discover damaged wiring or corroded connections during inspection, professional help ensures safety. Any modifications to your main electrical panel should be done by someone familiar with RV electrical codes.
Monitor your battery bank regularly with a good battery monitor like the Victron BMV-712. This prevents the deep discharges that killed your Go Power inverter. Keep battery terminals clean and tight, and ensure your solar controller is properly configured for your battery type. Consider adding a temperature sensor to optimize charging in extreme weather.
Regular maintenance of your inverter installation includes checking connections, cleaning cooling vents, and monitoring performance. A well-maintained 2000W pure sine wave inverter should provide years of reliable service in your Southwind.
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