Hey folks, I'm getting ready to move off the grid and could really use some advice on my power setup for my tiny house. I have a basic understanding of the different systems but I'm a bit overwhelmed with all the details. Here's what I'm planning to power:
**AC Items:**
- KitchenAid mixer (275w/120v)
- Freezer (150w/115v)
- Two laptops (200w total)
**DC Items:**
- Air conditioner (100w/12v)
- Fridge (100w/12v)
I definitely need the KitchenAid, so I'm wondering if a 1000w system would be sufficient or if I need something more powerful. Also, if I'm using both 12v and 120v equipment, will I have to set up two separate systems with different batteries, solar panels, and inverters? I'm looking for the easiest and most cost-effective way to set everything up. Any insights or tips would be super helpful, thanks!
2 Answers
It sounds like you've put a lot of thought into your setup! Based on the wattages you’ve provided, you’ll actually need about 1025 watts to handle everything at peak times. Just a heads up, though, I’m skeptical about that 100w rating for your air conditioner; usually, you need more around 300w to cool a space properly.
Also, don’t forget, a lot of appliances don’t run continuously, so the actual power they consume can differ from their rating. For instance, your KitchenAid may only run for about 30 minutes a day (0.2 kWh). If we factor in everything – lights, heating, etc., you might be looking at around 10 kWh needed per day. To handle that, consider a minimum of 2 kW of solar panels and a 3 kW inverter to start everything up.
Lastly, you’ll probably want some big cables connecting your setup to ensure sufficient power flow. There’s a lot to consider, but it seems like you’re on the right track!
You’re definitely in for an adventure with your off-grid setup! If I were you, I'd recommend going with a 48v system instead of 12v. It simplifies things quite a bit and can actually save you money overall. The downside is you can’t charge it from a vehicle, but it’s worth considering if you want an easier layout.
For your batteries, you’ll want at least 10 kWh of storage, which is about 3 batteries rated at 300 amp hours each. And don’t overlook your solar charge controller; a good MPPT charge controller will help manage your setup efficiently. If you plan carefully, you can keep costs reasonable, around $5000 for everything. Don’t forget a backup generator too, just in case the sun doesn’t shine!
Solid insight! Also, don't forget to double-check your wire sizes because that can be a real pain if things aren’t set up correctly. Always better to err on the side of caution!
Great advice! Just to add, when dealing with batteries, make sure to check that you have enough storage. You might need about 30 amp hours per kWh, so plan accordingly!