To build this rig cost under $300 aud I'm fairly impressed with it. There was 90ah so about 2kwh pumped into the HWS & for me to buy that 2kwh of energy from the grid it would cost me about $0.50cents so ROI would be 600 days - would you do it for that ROI?

Costs would be even cheaper if you had some old solar gear laying around!
3 used 250w panels - $120
Some DC Cable, YBranch Connectors & MC4's - $30 https://ebay.to/2Iu6fZe
DC/DC 100a relay & Heatsink $55 https://ebay.to/2KIgNGG
600w 24v DC hotwater element - $35 https://ebay.to/2K5aVIk
10yr old 50l hws - $30 https://ebay.to/2F3fcHV

Add the cost of a few copper pipes & fittings and you have a sub $300 hot water system that'll last years and provide about 50lL of hot water per day.

some of the parts used here
Kudom 100amp DC relay - https://ebay.to/2KIgNGG
DC Element 600w 24v https://ebay.to/2K5aVIk
Clamp Meter -- https://goo.gl/z8b4uJ

💰Save up to 10% at these stores with coupon code ' powerwalls '💰
🔵 BatteryHookup USA - https://bit.ly/BatteryHookUP
🔵 BigBattery USA - https://bit.ly/BIGBattery
🔵 Lithium Power - Australia - https://bit.ly/LithiumPowerAustralia

Second Life Storage Cell Finder -
🔋 Paolo Italy https://ebay.to/38xPUhT
🔋 Tim De Groot NL https://ebay.to/2OX9koS
🔋 Power 2 Spare USA https://ebay.to/2SuJWsr
🔋 Pro-LOX Netherlands https://ebay.to/2HsyPKr

💻💡DIYPowerwalls Community Facebook Group 💡💻
►   / diypowerwalls  

Official forum thread with all the extra details to fill all the gaps -
👍 Total Project Cost - https://goo.gl/cfLqZf
👍 18650 wall mounts - https://goo.gl/xDUzSV

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Cheap BMS - http://s.click.aliexpress.com/e/eX4NpXsc
Quality BMS - http://www.batrium.com
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Learning resources -
🔖 DIY Lithium Batteries- https://amzn.to/2MC4BaM
🔖 Mobile Solar Power Made Easy - https://amzn.to/2Tzk6TA
🔖 DIY Solar Power - https://amzn.to/2IgxfMa

Recommended Gear -
🔵 Clamp AMP Tester -- https://goo.gl/z8b4uJ
🔵 iCharger X6 - https://goo.gl/GtBtW9
🔵 Flir Thermal Camera - http://bit.ly/35qWwgh

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💸 Amazon Store - https://www.amazon.com/shop/hbpowerwall
💸 eBay - https://goo.gl/tk6Qdd
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Social Media -
► Forum - http://www.diypowerwalls.com/t-HBPowe...
► Facebook -   / hbpowerwall  
► Twitter -   / hbpowerwall  
► Insta -   / hbpowerwall  

Become a channel Sponsor -
💵 Patreon - https://www.patreon.com/user?ty=h&u=3...
💵 PayPal - https://www.paypal.me/homebrewpowerwall
💵 Merchandise - http://www.diypowerwalls.com/18650ED

Thanks for tuning in as always!

Pete
#solarhotwater #diyhotwater #diypowerwalls #hbpowerwall