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Computers & Networking
Opensprinkler boards Round 2 Q & A
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<blockquote data-quote="tangmonster" data-source="post: 749962" data-attributes="member: 1581"><p>it looks like yebo has no stock.</p><p></p><p>Give ACDC a ring in paarden eiland for their 30VA.</p><p></p><p>I would spend the extra R50 and get their 30VA:</p><p></p><p>T-30VA 230/24 1 PH TRANSFORMER 230:24V R277.00</p><p></p><p></p><p>They have 9 in stock according to their website in cape town.</p><p></p><p>Crude calculations with headroom:</p><p></p><p>1 amp 24V rating should be just fine. the sprinkler solinoids draw around 200mA each.</p><p></p><p>a single Ac relay will be less than 100mA , but lets make it 100mA for headroom/</p><p></p><p>So with 2 relays ( light / wellpoint pump) and a solinoid you have 400mA = 9.6W ( crude 0.4 x 24V)</p><p></p><p>raspberry pi 3 is rounded up with headroom wifi enabled 500mA on 5V so that is 2.5W. (enough headroom to take into account for the regulator effeciency)</p><p></p><p>2.5W + 9.6W = 12.1 Watt.</p><p></p><p>you will most probably be fine with 20VA... But you are driving around and getting parts so go for the 30VA at acdc</p></blockquote><p></p>
[QUOTE="tangmonster, post: 749962, member: 1581"] it looks like yebo has no stock. Give ACDC a ring in paarden eiland for their 30VA. I would spend the extra R50 and get their 30VA: T-30VA 230/24 1 PH TRANSFORMER 230:24V R277.00 They have 9 in stock according to their website in cape town. Crude calculations with headroom: 1 amp 24V rating should be just fine. the sprinkler solinoids draw around 200mA each. a single Ac relay will be less than 100mA , but lets make it 100mA for headroom/ So with 2 relays ( light / wellpoint pump) and a solinoid you have 400mA = 9.6W ( crude 0.4 x 24V) raspberry pi 3 is rounded up with headroom wifi enabled 500mA on 5V so that is 2.5W. (enough headroom to take into account for the regulator effeciency) 2.5W + 9.6W = 12.1 Watt. you will most probably be fine with 20VA... But you are driving around and getting parts so go for the 30VA at acdc [/QUOTE]
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Opensprinkler boards Round 2 Q & A
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