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How to choose PV & Battery for BSP-300?

How to choose PV & Battery for BSP-300?. Base on optimal assumption!. Outline. Assumption of usage in optimal case Factors in the PV and Battery installation. Assumption. System Requirement & Assumption BSP-300 system: 8 Watts 1 x 25W AT Camera: 25 Watts

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How to choose PV & Battery for BSP-300?

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  1. How to choose PV & Battery for BSP-300? Base on optimal assumption!

  2. Outline • Assumption of usage in optimal case • Factors in the PV and Battery installation

  3. Assumption • System Requirement & Assumption • BSP-300 system: 8 Watts • 1 x 25W AT Camera: 25 Watts • 1 x 802.11a/n AP: 7 Watts => Total: 40 Watt/hr • Environment Factor (Optimal Case) • 8hr sunshine at daytime • 16hr power consuming from battery at nighttime • We got 40w x 16hr (640 Watts) per night consumed • The minimal battery capacity required should be 640 watts • 640W/24V = 26Ah (i.e. 12VDC Battery 26Ah x 2 required) • Also, that is 80 watt/hr (640w / 8hr) need to be reserved for charging

  4. Get the first PV required • How it calculated • PV power up the system & device • The rest power budget then be used for charging X – (Y+Z) = N N then is the budget for Charging So in optimal case: X = Y+Z+N = 120W That is base on the assumption 120W PV required. 120W / hr PV X watts 40W / hr to power device 80W / hr For charging BSP-300 Y watts Battery N watts Device Z watts

  5. Factors in the Battery Installation • Environment Factors • Duration of Sunshine • How long for PV to power the system and also charge the batteries • Battery Efficiency • There are discharge efficiency that effect the capacity of battery • Temperature • Temperature will effect the efficiency of batteries for discharge and charge

  6. Day 1 Day 2 Factors in the Battery installation • Duration of sunshine • Need to check the Weather Bureau for average hours per day locally • Need to check the cloudy day duration (say, the cloudy day will lasting for how many days) Battery Not only sustain for Discharge at night Charging Discharge Charging Discharge Battery need to sustain for upcoming days’ insufficient charging Sunny Cloudy Cloudy Cloudy Sunny Cloudy Cloudy Sunny

  7. Factors in the Battery installation • Battery Efficiency • Different Battery will have different discharge efficiency • Lead-acid, for example, 70% ~ 80% Charge 100% IN Discharge 70% OUT

  8. Assuming the battery capacity formula C: Capacity (Ah) W: The system load (W) T: Discharge hours (h) Bf: Battery Discharge Efficiency Vs: BSP-300 cut-off voltage (to protect battery over discharged) Dc: Cloudy days of the area So previously, we have 26Ah Battery C = 40W x 16h / 24V Then the one close to the real environment will be C = [(40W x 16h) / (22V x 0.7) ] x (1+Dc) =42 Ah We got 42Ah (assuming no cloudy days) And if with 1 cloudy days C= [(40W x 24h) / (22V x 0.7) ] x (1+1) ≈ 120Ah W x T x (1 + Dc) C = Bf x Vs Battery Capacity Formula

  9. Factors in PV • The PV is also with Efficiency • Say for example: 80% • So the new PV required will be: • N = (640W (sunny day1) + 960 W (cloudy day2)) / 8 = 200 Watt • PV = (200Watt + 40Watt) / 80% = 300 Watts • To apply to your system, please check the Excel work sheet below.

  10. Factor in Temperature • The Temperature also will effect the efficiency of battery the battery should installed in a shelter to provide stable and reliable power for BSP-300 system.

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